Shell evolution of stable N=50-56 Zr and Mo nuclei with respect to low-lying octupole excitations

E. T. Gregor, Marcus Scheck, R. Chapman, L. P. Gaffney, J. Keatings, K.R. Mashtakov, David O'Donnell, J. F. Smith, Pietro Spagnoletti, M. Thuerauf, V. Werner, Callum Wiseman

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Abstract

For the N = 50-56 zirconium (Z = 40) and molybdenum (Z = 42) isotopes, the evolution of subshells is evaluated by extracting the effective single-particle energies from available particle-transfer data. The extracted systematic evolution of neutron subshells and the systematics of the excitation energy of the octupole phonons provide evidence for type-II shape coexistence in the Zr isotopes. Employing a simplistic approach, the relative effective single-particle energies are used to estimate whether the formation of low-lying octupole-isovector excitations is possible at the proposed energies. The results raise doubts about this assignment.
Original languageEnglish
Article number50
JournalEuropean Physical Journal A
Volume53
DOIs
Publication statusPublished - 15 Mar 2017

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    Gregor, E. T., Scheck, M., Chapman, R., Gaffney, L. P., Keatings, J., Mashtakov, K. R., O'Donnell, D., Smith, J. F., Spagnoletti, P., Thuerauf, M., Werner, V., & Wiseman, C. (2017). Shell evolution of stable N=50-56 Zr and Mo nuclei with respect to low-lying octupole excitations. European Physical Journal A, 53, [50]. https://doi.org/10.1140/epja/i2017-12224-7